500 



SCIENCE 



[N. S. Vol. XLIX. No. 1273 



Inoculations have been repeated several 

 times and each, time there was produced a re- 

 action not shown in the controls. These re- 

 sults have been obtained both on potted trees 

 and trees growing under field conditions. The 

 experimental conditions were at the optimum 

 for canker development with very favorable 

 moisture environment and vigorously growing 

 host plants. The results warrant the state- 

 ment that P. oitri upon stem tissue of Lansium 

 domesticum produces a reaction not evidenced 

 in control inoculations. 



These results are recorded as of possible in- 

 terest in throwing new light on the character 

 of the canker organism. It is conceivable 

 that a chain of circumstances in the field 

 might produce extreme optimum conditions 

 that would lead to infection of highly resist- 

 ent host plants, which from observation under 

 ordinary conditions would be regarded as im- 

 mune. Lesions on such hosts then would be 

 capable of serving as sources of reinfection 

 to citrus plants. H. Atherton Lee, 



Elmer D. Merrill 



BuEEAU OP Plant Industry, 

 Washington, D. C, 



BuKEAU or Science, 

 Manila, P. I. 



THE NEBRASKA ACADEMY OF 

 SCIENCES 



The program of scientific sessions of the meet- 

 ing held in Lincoln on May 2 and 3, -was as follows : 



FRIDAY, MAT 2 



Afternoon Session 



Tile algal flora of some of the sandhill lakes : Elda 

 E. Walker. 



Corn adaptation studies: F. D. Keim. 



The development of Cyathus and Crucibulum: 

 Leva B. Walker. 



Stem rust control through iarberry eradicaiion: E. 

 Mead Wilcox. 



S,oot habits of plants of prairies, plains and sand- 

 hills: J. E. Weaver. 



Notes on NebrasTca trees: E. J. Pool. 



Bacteriology and pathology of influenza: H. B. 

 Waite. 



The seasons in 1918 from the standpoint of the 

 zoologist : Robert H. Wolcott. 



The mental testing far college entrance: Eufus C. 

 Bentlet. 



Validity of the intellectual tests: Charles 

 Fordycb. 



The need of community educational and human wel- 

 fare get-together clubs: G. W. A. Luckey. 



Future world war: A. E. Sheldon. 



Projection charts: H. G. Deming. 



TJie state academies of science: D. D. Whitney. 



Evening Session 

 The annual presidential address, by David D. 

 AVhitney, professor of zoology. University of Ne- 

 braska. Subject: "Eecent progress in the study 

 of heredity." 



SATURDAY, MAY 3 



Morning Session 

 Place names in Nebraska: Susan Harmon. 

 A coin display case for museums : E. E. Blackman. 

 Radioactivity in tlie high school: Floyd Doane. 

 A plea for elementary astronomy in the schools: 



W. F. Hoyt. 

 A new way of tracing cardioids: William P. 



RiGGE. 



Some electrical phenom,ena connected with rainfall : 



J. C. Jensen. 

 What weather makes a great wh-eat yield: G. A. 



Loveland. 

 The two great observatories in California: G. D. 



SWEZEY. 



On a phase of chemistry in modern warfare: C. J. 



Peankporter. 

 Fat substitutes: Maey L. Fossler. 

 Automobile accidents: O. W. Sjogren. 

 Notes on personal experiences in the potash fields: 



J. E. Murray. 

 Oil shales of Wyoming: E. F. Schramm. 

 Potash surveys: G. E. Condra. 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Adveincement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON. N. Y. 



NEW YOI«C, N. Y. 



Enteied in the post-office at Lmncutcr, Pa., at tecocid cI«m matter 



